Blame Scripts/tcar_getConfigLines.sh

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#!/bin/bash
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######################################################################
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#
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#   tcar - The CentOS Artwork Repository automation tool.
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#   Copyright © 2014 The CentOS Artwork SIG
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#
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#   This program is free software; you can redistribute it and/or
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#   modify it under the terms of the GNU General Public License as
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#   published by the Free Software Foundation; either version 2 of the
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#   License, or (at your option) any later version.
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#
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#   This program is distributed in the hope that it will be useful,
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#   but WITHOUT ANY WARRANTY; without even the implied warranty of
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#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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#   General Public License for more details.
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#
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#   You should have received a copy of the GNU General Public License
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#   along with this program; if not, write to the Free Software
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#   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#
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#   Alain Reguera Delgado <al@centos.org.cu>
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#   39 Street No. 4426 Cienfuegos, Cuba.
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#
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######################################################################
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# Standardize the way configuration lines are retrieved form
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# configuration files. As arguments, the configuration file absolute
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# path, the configuration section name, and the configuration option
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# name must be provided.
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function tcar_getConfigLines {
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    # Initialize absolute path to configuration file.
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    local CONFIGURATION_FILE="${1}"
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    # Initialize configuration section name where the variable value
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    # we want to to retrieve is set in.
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    local CONFIGURATION_SECTION="${2}"
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    # Initialize variable name we want to retrieve value from.
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    local CONFIGURATION_OPTION="${3}"
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    # Verify configuration variable name. When no variable name is
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    # provided print all configuration lines that can be considered as
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    # well-formed paths. Be sure configuration variable name starts
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    # just at the beginning of the line.
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    if [[ ! ${CONFIGURATION_OPTION} =~ '^[[:alnum:]_./-]+$' ]];then
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        CONFIGURATION_OPTION='[[:alnum:]_./-]+[[:space:]]*='
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    fi
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    # Retrieve configuration lines from configuration file. Don't sort
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    # the value of this value so as to preserve the order given in the
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    # configuration file. This is important because configuration
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    # files are being used for setting render-from priorities.
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    local CONFIGURATION_LINES=$(cat ${CONFIGURATION_FILE} \
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        | egrep -v '^#' \
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        | egrep -v '^[[:space:]]*$' \
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        | sed -r -n "/^\[${CONFIGURATION_SECTION}\][[:space:]]*$/,/^\[/p" \
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        | egrep -v '^\[' \
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        | egrep "^${CONFIGURATION_OPTION}")
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    # Output value related to variable name.
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    echo "${CONFIGURATION_LINES}"
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}